单选题 The pictures of the Loch Ness Monster show a remarkable resemblance to a plesiosaur, a large water reptile of the Mesozoic era presuming extinct for more than 70 million years.
【正确答案】 B
【答案解析】[解析] 本题考查副词应用。分析句子可知，此处应填入一个副词来修饰形容词extinct, presumably“大概”符合句子结构。suppose和presume为动词，均表“假定，认为”，presumptuous是形容词，表“专横的”，均不合句子结构。故答案选B。